diff --git a/build_files/build.sh b/build_files/build.sh
index 9b8fb97..559bea5 100644
--- a/build_files/build.sh
+++ b/build_files/build.sh
@@ -52,7 +52,21 @@ chmod +x /usr/libexec/kamos-install-flatpaks
 systemctl enable kamos-flatpaks.service
 
 ### ---------------------------------------------------------------
-### 6. System defaults
+### 6. Disable repos with missing GPG keys (breaks ISO depsolve;
+###    harmless for users — OS updates come via the container image)
+### ---------------------------------------------------------------
+for repo in /etc/yum.repos.d/*.repo; do
+    for key in $(grep -oP "(?<=gpgkey=file://)\S+" "$repo" 2>/dev/null || true); do
+        if [ ! -f "$key" ]; then
+            echo "Disabling $repo (missing GPG key $key)"
+            sed -i "s/^enabled=1/enabled=0/" "$repo"
+            break
+        fi
+    done
+done
+
+### ---------------------------------------------------------------
+### 7. System defaults
 ### ---------------------------------------------------------------
 # Enable weekly automatic OS updates (staged, applied on reboot)
 systemctl enable rpm-ostreed-automatic.timer || true